I have re-posted this question here in the platform group as it is a
more appropriate forum than RCP.

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I am working on an RCP project with an Intro page. This was working well
on Indigo but following a move to Juno SR1 the behavior of the intro
page has changed.

Now when the application starts up the Into appears to the right of the
default custom perspective (See Image1) instead of being full screen as
it used to be. This are remains there even when the Intro display is
closed (See Image 2).

Any ideas on what is causing this, or what I need to do to make the Into
appear full screen?